1970's 

•      In 1979, Margaret Thatcher First Woman Prime Minister of Great Britain

Margaret Hilda Thatcher, (born 13 October 1925) is a British politician, the longest-serving (1979–1990) Prime Minister of the United Kingdom of the 20th century, and the only woman ever to have held the post. A Soviet journalist nicknamed her the "Iron Lady", which became associated with her uncompromising politics and leadership style.